Can CFD do this???

[atm98]

Here is a simplified scenerio:

Submerge a cup in a large tub of water. Let the air out and flip it upside down. Attach a string to the closed bottom (now top). Apply a sinusoidal movement to the string from surface to simulate wave under a boat.

I am interested in the general dynamics: cup movement, fluid flow, force on line, cavitation.

Is this a reasonable request for a CFD program given the movement? Whast would be a good package to look into?

Thanks for any input.

 

[FeX32]

Interesting scenario. That is a real multiphysics question. For this I would suggest looking into Comsol Multiphysics. I have used it quite often for the past few months for FSI.
I have seen it used for mixing of a highly viscous oil and water, which would be similar to your problem by replacing the oil with air.
Good luck,



Fe

 

[BigInch]

From the little I know about CFD, I think the 2 phases will be problematic. You might want to x-ref this thread to the CFD forum.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[atm98]

I don't mind if the analysis cuts the rope so everything is under water. I just need the sin input.

 

[BigInch]

Openfoam

http://www.opencfd.co.uk/openfoam/

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[simplemath]

If no cavitation is needed, it becomes a VOF task.

--It boils down to simple math--